For doors, experts recommend grade 1 deadbolts for security. Durability and Materials: The material used in a lock affects its durability and strength. Opt for locks crafted from materials like brass or steel for longevity. Quality materials also help the lock withstand elements ensuring performance over time.

The key serves as a security token for access to the locked area; locks are meant to only allow persons having the correct key to open it and gain access. In more complex mechanical lock/key systems, two different keys, one of which is known as the master key, serve to open the lock.